Structural characterization of the nickel(II) formate complex, Ni(py)4(O2CH)2·2py, and re-evaluation of the nitrate counterpart, Ni(py)4(ONO2)2·2py: Evidence for non-linear nitrate coordination

The molecular structure of the nickel formate compound, Ni(py)4(O2CH)2·2py, has been determined by X-ray diffraction, thereby demonstrating that the formate ligand coordinates in a unidentate manner. A similar investigation of the nitrate compound, Ni(py)4(ONO2)2·2py, indicates that the nitrate ligand also coordinates in a unidentate manner; however, the Ni–O–NO2 bond angle is distinctly bent, in contrast to the linear geometry that was previously reported.

Graphical abstractThe molecular structures of the nickel formate and nitrate compounds, Ni(py)4(O2CH)2·2py and Ni(py)4(ONO2)2·2py, have been determined by X-ray diffraction, thereby demonstrating that both ligands coordinate in a unidentate manner. Of note, the Ni–O–NO2 bond angle is distinctly bent, in contrast to the linear geometry that was previously reported.Figure optionsDownload full-size imageDownload as PowerPoint slide